PURPOSE: To reduce the size of an adsorption unit and to effectively recover the remaining part of solvent vapor by making a branched conduit to the adsorption unit connectable to a circuit between a direct air cooler outlet and an air heater inlet.

CONSTITUTION: The air circuit for drying of the goods in a drum housing 1 is created after ordinary washing and centrifugal sepn. by a blower 8 disposed in a vent sleeve 4. At this time, the goods are dried by the heating air from the air heater 6 and the generated solvent vapor is introduced to the air cooler 5 where the solvent vapor is recovered by condensation. The operation of the air heater 6 is stopped after drying of the goods and valves 8', 12 are opened in the state of bypassing the air by a bypass 18 and the blower 10 is activated to introduce part of the cooled air to the adsorption unit 11. At this time, the inlet side conduit 9 of the adsorption unit 11 is connected to the conduit circuit behind the air cooler 5, by which the remaining part of the solvent vapor is further condensed.